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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dd202446da5fd3ad84f785a90c233d0c151b3d877b400f12fa67d6b51c96313' 
  AND token = 'Xr6ANN40LxtdOGHLafKIho6NDVW5kHd1SsoWINjt9Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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