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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6b36c7a85edc3c2f8c6c725b89dd7fbd7046a007839d12617fb9421b59576b' 
  AND token = 'tRu9OEwU/tFSw+RGvOy9/YMFWet8ZErCphWnUMrRGuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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