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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2931761c509185f8f97d177be177c9eeacbb32c8abf04260f47751bc5b8d510e' 
  AND token = 'xBdrT/o0yd2nhJqiyqU2TQjKzjT+/NkRoRxLnkuXqkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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