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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d1d7129a5b955a8701d0424e608ab272f6dfd675f8384220fb712b75733c9e' 
  AND token = 'ths0yFjFDG/v7ruwiJIW4eIEbL8F775Bq5+ppFJQ9s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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