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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69c6e5a7caa4e0025de3378602303a035adc5838b30293fec2e696622b54f97' 
  AND token = 'gt0GdsT46iyMPWbuk2xTcvwlFPzopEwEp8cCFjs662Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}