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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ae913f9ef01494df7f0e61bd2a6a88efb19f0f1000120c4874089d92b697100' 
  AND token = 'R0PAWB0YkaPQEedjkcWe+zH3m8ee67hbXZ+ZwQuHoCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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