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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ca8793ad1428fe8dcd8782c2e0e136025d03ca856688e3cb73fa5071f47fda' 
  AND token = '0EHuQMIpWY27R/+Xeoyh9k8del0Z6/ghOe4u8//USvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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