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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e207acfc576046fcae55a3aa46134744a34cf8fa59cb00752b7b5abfde759c9' 
  AND token = '64sWmrMq1APNE4HpNSxfsaTPFl16eK8yndckQQB8wqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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