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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f3412b53f94d47a8aa115ecc8a3470260568e9dac6143c10a55521743ea79d' 
  AND token = 'naayLKjmhwqtMmCFiLgzYVp8E6pjORy7Fl9kNQ9D9dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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