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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2874cea150514e57e173f0d8e2b286363b55c51ede91aaebe6edef4a4ab360' 
  AND token = 'Sy3ssATRysweV7wwmeUbC8NrZrQU4HQLnJmg5f1KiXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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