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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04468797f1ced4aaa22418b347c80856c30f798560e705d628110e73e6f1263b' 
  AND token = 'Sc35D6aecA52m15o2qdznl7xex1HLIJkVqbQzTjKbGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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