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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ad69e4cd62477e86d7b2bfad3ee9dd8e0b8b485eef8acf5cdfb1a24cb80b5f' 
  AND token = 'G/8ettoZG6MKRtaI8Rrq8xYIww3YxI3lIEuAUcJg6GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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