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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d41ab9380dacdd969a4ce5c32b4caf6038cb9bc75b7c864ab45f6101233a14' 
  AND token = 'TTCUUrv18QA4vGzlWokApGvungmX5751U/AIqPu2BX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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