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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d1b1a29329b850946c2ac47873b461bd73af1b95be4fbc7a08eeb54ec6a090' 
  AND token = 'UKAUPgfM1cXje9KevRvDV+q/k7iYIZ4G9pkFvT9A3DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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