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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7626065c83cb2a512245e73ea77ded814b87079feb0d7a48db800051a4c644' 
  AND token = 'og3AIaVeEJATqmlYp8mQAkexZEO+KcBsDcxWH4kSkTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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