SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0705838ed2297a7dafa9a284792423c06ec6be5710d5bd13c6b65f14128a886' 
  AND token = 'lZ/+xo1qQBA68q7MSuwW/qGPTjeWFgCAmBf0YJ2L18Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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