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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbeacbc197e8ce9775874ddb888d9bf4adb3b219d13225b3db05ef09f69a1706' 
  AND token = 'Czt8feXOfVDV3w8DUt0DUDhw0sH51VWsDzFunjNESQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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