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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa898e08725023ec762dd09a85ca838a820ae2be98de15206a392b654174085' 
  AND token = '6zeFiEXMgp79AMknQ+Or+ySKDOd4RSo7FpKgDwSXBAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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