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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65bc812d024b16f99f7314a2ca2d1b76310f7955840b9eacfdf32df5a282d072' 
  AND token = 'YpjZ4p8OL2pf5AvDKEv24CbEISWpyRalDOtOnxWBbKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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