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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1879802314edde89494c46585ec62eede6fdc7d1da0a9c35b356d693e26783f6' 
  AND token = 'AAK2p9ztbWaYsIaDKkApki3+UVoMQEenZs03BVw0D4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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