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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263f286f2b62c156fc96cf8f920fcb02a8b78db820603d96b5ba225b81f906d2' 
  AND token = 'glfFuI9TXmciop99eLJXIUmX8yHcNqOCU9dOLgfpf9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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