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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f08465360d1adef140e52cee93f144cb01f93989c84abac6c7e6c9dc8ffc2db' 
  AND token = 'ZI01o2Qvfk016YavrC9hhoeX2wY4mItjFTX/0Lnq5rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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