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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6fe140d4eb047a37117cc67297972b06a425fa1fc332fb311f08131028b2e3' 
  AND token = 'MbrEkuoMM19x/xw7FSEriQCw3CsVcURJLgkXpu39VKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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