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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5587be405df9ffa27318af59a18148ff87e1f2a21d336df692411f479c44ac' 
  AND token = 'B8fuWzGaZkz3HOokIj7MjIEKF1tfXRfFT9hib+rJ4Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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