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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b139679ae658a2ebfb4d8e484855b30cdd1c7d8b587868920661e776586362' 
  AND token = '9zlp43Na5cgxvBLx0C9M0xqxs0PqSyHZBpY9Z56ix+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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