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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b4e3622c7572c9d46bfc97d7f47aded6968a2a09113e19981dd79de3dd00a3' 
  AND token = '9653HopVX5kohWnr/eQ+0DGw7ZyeFfZIeG7YyuO3QGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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