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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2cb122430226c81e585cc03c7194220e9e2da9a86b7698a0b397fe87b98ab79' 
  AND token = 'fL1f6UtF4FyTWlwIqd8Jqsy9tHeHrxmoMdN1SeyNNEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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