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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77dc5db95b6028992348fcd67f33fa1a3100adfef4753dc8b25345c961e8603' 
  AND token = 'WxOd0RXsFiANSKADIuL1TuSDJy/Dss6j1z2EprCXqGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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