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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2c6faa87919846fc1fc444106ac4fc42e87af03e298f0c0319679b289a9cf4' 
  AND token = 'fSCLoCvad4oZd9b467EwBP9S+fasFg42DQKOIfzmAIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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