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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb369694d51f51ae76e68e12b560a35f0400de482e31c85d3c5d36d6ce5b5f25' 
  AND token = 'UqiD7yClOlQ9nBY8CU5CEgplXNwzxyq+LI7jxmkegrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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