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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a8cd40d0e072a259b1d5365a7eef8cac85fa0897c5c3bfbf6b47fefd44ab64' 
  AND token = 'SQcGpPL06k74rPDN6hCexGcoX5q5lpFO08A/hVo2SFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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