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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23398402f45a0b5d663c4f6cfd2f786684438abebb0da8cf1700ea5e95b50a99' 
  AND token = 'y1dbryuRcQMQZSrT1q3irDqctJAZYMzgzbvf0GZAOzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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