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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67a7bfbb96167175c7d1c684cb1886d886d950b4d320e56c740f15d227789f7' 
  AND token = 'qV5FHxwKsDgc8d7zmKj9c2dNW/VAiiWvB486HUl7vvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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