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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3d12d81c8d5ff2b6185c07ae178b21d826cac4529825f4e1836ce322e73543' 
  AND token = 'L5xk6afkrb3uG7Xqi0MFRE1b1ox8fXX/DH+7kygEYYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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