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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b775e05ce4bb94e34214cc6b4de8cd9d2a4c01c9455be8bb7eac4b72f72bcd29' 
  AND token = '/hyy3zjI8ADBQhlcWaYVN6xhOJfGEmezgLkMMQeJRWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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