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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '378610c9144339636edeeb310c70e25c862391aecb9dea1bc733f259a906884f' 
  AND token = '7yUSQiBgMfCFlHnvifC0y1qv0Ovw4CYhEr9L7PjGJ8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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