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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd031979b89366cec9be5fd33e3edeec2c5faa8c854c7dc82837b44272c2b8268' 
  AND token = 'Z1ALuqgdK2r3soNOF1Zefz6jxXCO59lUcXBglVdwbUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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