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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b2421d83f759fdbc9722a5499e5b6e0ba0c832bf6c81bcdbf419582df05520b' 
  AND token = 'LVw4Uiw89hVn5yIiSZ+ULN+hzHqaiff2dsFAE+My8Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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