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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447cb94392a0f68f076a1f57d3439d633b708ebc82df66a9895009ee3719e492' 
  AND token = 'UahCxIDvzErtuhJ0u2raHhUkuZb7Q17dO4dolXjaXiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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