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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af9aa7e91002ab8682b42ab7bcdd73d59b89aa00928ad287a9e47b5248baf49' 
  AND token = '84Mn7q+7xxclqo4VGovR4HdT/FelE/WnV2k1bww+Spk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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