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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3aa0cbb5f6323b07cea6872cf738c300f6bc1f768d7a447b131acb209d9f3c' 
  AND token = 'GfViBFiNmS78E5x7S8DOqog0NwthgmOEI7QOGEc5hzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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