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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ee49764303eff544b39ef69379592807a9f331d5467cc5b82dab08a0500fcb' 
  AND token = '+1Hls8CvDbNnSdOon9yjxHbGspX8f+BqTnHnPu5QxK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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