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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b9169d2779b16c01992fbf952da524b89130716e279ae86550cfa31ef23723' 
  AND token = 'Mg8S8U1/jX62ILfyL+yII8CM/6rNM6Xh/n7R0zT6vII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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