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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6a2f12f77265e6106b748e1ab4036b5df2ea7024d466eda811271c86e81a1c' 
  AND token = 'vjLmLurrD+iZ/23WtD6cy9lkReRR/dshxWsa75sN7Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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