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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d7c2bd50b051405345a71a576126d89ebb9d2078f40b92303ee4a0229ac8f5' 
  AND token = 'YLD3oaKOcgMwbH3po8H3UPSVnRJMSdNgPeEqV4WDook=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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