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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae48563cd76ce73c4851b336c1384a3386254da3696068a768b69ec6d2dd8ee' 
  AND token = 'hQ8rJB6m278B0RgYaI605orhS+Q8oHwEA4o/o3vLtr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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