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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc6c15bbb16a56a30e6dc051bc7dab4b76651638c31ecf104ce59312989872e' 
  AND token = '+IQZHizwFif0KRDjxUnJ+z0Hh13do+RdKZZBa7N2LbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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