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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51341796c3b9e767a33ddbfb11a7531a736eb137ec34b84272d82b9e1e8f8212' 
  AND token = 'GcjKOoMvMAtUDyvZkX2Q8KLZIKMraPd5+YPb9cf09Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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