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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ab396ab29a089196063db6a59062e9bf18ed2e6b240e7406771ca7e1e1902c' 
  AND token = 'PK68pKV95mUDB068rwdbb8fZJPhNcbYrJeHJQqcHVak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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