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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594379b86ccd2d54e71c70f19820f01be9fddd83ad6eb0a89bb2d23b71d44b97' 
  AND token = 'WS/6nZze/M1EV8WTvcvKo0lUNEhpAlTe+IX0SKlBshU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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