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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db05050d860073f5f4b0952f0bb1d9669d64054f839f48bd22bb168e98b2155d' 
  AND token = 'cs6xJDeYBU2IaHLngAVI23P94l/VdD5Mpj5JrUDSWyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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