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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790ec568738a4cb463b7447cec735a421ffa0c76114867eb3ebe07ec59a0fca2' 
  AND token = 'eJYyrB8iRVG9/CGUe0KlP2peRreYOv70Mj7tCv5cnjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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