SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0926411a8c44366d2934bc00cddcebd16b533e1ffb7bc1b629e649c3e8ff058d' 
  AND token = 'PThInBZcZrY99qjvAijFNbaV/E1EnUiDaAk/zf3ciOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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