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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e4cc2824b7b3239a0cadc487d3e2f3f84cf7c6b7e64989751d7ac3b635f4c3' 
  AND token = 'TBnh8RrIQMgjvMgEu+oKSuPDI2n+UZWFfwnnk9c7QZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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