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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054b13a903d2a5981060a51f24bfdc584b9bd86978ba72bc849d5f50888e9353' 
  AND token = 'KSVsSz8NVvBnWXpbtmsw+fV2dQjA1Tg5PlOjpjchey0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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