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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ea274e7988c489988c92154a442e5cc4808fcdce517435555c7c398b03f5f7' 
  AND token = '31ccvdLEKjO7tHtDK8Fm0ReEcdnhu1WhgywN2dv7gkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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