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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c3d10b5e03ce996653285005ea17ff23dc58210db591dad1409971dc52f81f' 
  AND token = 'nnZjawP0duwlC3O7kf/FkrlLujaVj1Ywoch9Ke2Z9Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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