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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0ee17405e48e626ba09b6e9f8e83e49781c915bfa28606517b6117c8cb194b' 
  AND token = 'X0Yj0HlLw4Tne0dwBJMsQEZ5WCr3VMAnqqnSPbW36KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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