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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef63f3ec2b362f03c2e3276b16301ef047656ba3e4a850182011d8167ca08690' 
  AND token = 'uxC+9qSkX4MP/10Uui/aOTUK7ZJ/W6H184XFxxVV1yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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