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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2023f8dc746fc7a57e94b3f0c556ad9a8a7e615d7d386561af3e1e9e0cf730' 
  AND token = 'f8jhl4QYJmApZQPwM7F+3aLXwtmVaydSQVj8wNafNHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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