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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede9b57fbd7d71288a6d72626ae5efcc2eaa2f762c04cd177f165d36653d5105' 
  AND token = 'eA8G5HrtReO1zqn7VJq7Kl01Frb3dsz9HUf/BKAotts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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