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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d2ea526db7ca741d943f4529b6077b59306a710c0d77565ba009aaa6abc25c' 
  AND token = 'ES4Qxsac6wZJUQ6O41Oa6FfUx98LYrrLrDP3ukH7GFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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