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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b39512c7c66d530b0b89faa62b6dfd6b34ab3889f709d32d9eaef7a69b097d' 
  AND token = '8OwqiIh45bdY/1nQ8jWbatAz8TOcERAjOdVPYnWPKog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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