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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7809aa24486960ccd39b6dba14ee003c78a89034c6d613de29a704e52d9652a3' 
  AND token = 'l7PAB3SCYj0CN2zk9zUGRYOxehnVEiTc/CCwBjeqkLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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