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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbac30bf60e3d96e63d20091acbe79e4a684206055f6ef4c23ed754486db0459' 
  AND token = 'sTtcIt1rmqEOz8qKOLjZBRKlL86G0W7cUTmAWffK2eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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