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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4309439e21a5673447d7463cbc9f8a456c183c2c796e0784a53d9f01c39590' 
  AND token = 'BTOfDEboOoxLVTelg0llmdPMlpLsv7fXtpPIeDHn6O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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