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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a855428c64f176f20cff09a622e8d58a51129fff0e87bdb986040b16b49f37' 
  AND token = 'NQ4GhlKpy3QTiLBg2MdZaxy4cGOB7duJLP0IrKnKVtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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