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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10cc4f08d6e6cb358978387b5e85e21723652f78b9b1c5a8a5bbb14d31e1cb2' 
  AND token = 'rwfLmOzp+nEKVH7pCsV/wftrO4jmcfytwzkoojh519I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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