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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515787cd54cf33f6f1f8226f067a94acadf9d5c43f17e38af941e18b90af2ad3' 
  AND token = 'KukLeKaIYG6ziHnReCAwGAt+qF7XOUwMOtYISy7yMFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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