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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda88579bd8e4033581d9bac91febfd16c52aed60f971b01b88987615efa8233' 
  AND token = '5wwaF6igHTs7zkW1/0v7LThUi5q3qTrHuu+szo0u3nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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