SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658942b271fb2be0c37c11d08b8817d698c6b2f9991795621ed90759997d7ffa' 
  AND token = 'ki9Kp/Tqkb+j/hgbDU4hGB67Z3pJOSwfcGvQWia9pgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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