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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3669b0a428a20d5cd1de8e102c37d896980a79ae09190e5f6abddf563a60b0' 
  AND token = '9makbqVscw7dnOGAdNPUi00cIzc0q1bGT2sccmjUmX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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